摘要
为给起落架稳定性合格审定提供依据,国内首次在某民用飞机上进行了摆振试验。试验时,在跑道上安装了激励板,飞机按要求的速度滑过激励板以激励起结构的动态响应。子空间模态参数辨识方法被引入到数据处理中,为剔除虚假模态,稳定图被引入以判别真实模态频率和系统的阶次。最后给出该飞机起落架的模态参数辨识结果。结果表明:激励板能有效地激励起结构的动态响应,结合了稳定图的子空间模态参数辨识方法给出了较好的辨识结果,起落架未发生摆振。
For the first time in China,a shimmy test was carried out on a civil aircraft to provide a basis for the qualification of landing gear stability. In the test,the excitation plate was installed on the runway,and the aircraft slid over the excitation plate at the required speed to excite the dynamic response of the structure. Subspace modal parameter identification method was introduced into data processing. In order to eliminate the false modal,stability diagram was introduced to distinguish the real modal frequency and the order of the system. Finally,the modal parameter identification results of the landing gear were given. The results show that the excitation plate can effectively excite the dynamic response of the structure,and the sub-space modal parameter identification method combined with the stability diagram can be used for better identification,and the landing gear does not shimmy.
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